Patent US1595538A successfully refreshed from Google Patents.
Patent EP0636482A2 successfully refreshed from Google Patents.
EP0636482A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ink jet printing apparatus and ink jet printing method
Assignee: Canon Inc
•
Filing: 1994-07-29
•
Granted: —
•
Expires: 2014-07-29
Abstract
Abstract In the case that a size of each liquid droplet is enlarged to such an extent that liquid droplets each having a different color comes in contact with each other on a printing medium before completion of penetration into the printing medium, e.g., when the number of liquid droplets nb required for forming a black pixel and the number of liquid droplets ny required for forming a yellow pixel are "7", a maximum number of liquid droplets capable of overlapping each other at a substantially same location is limitatively determined to assume a value smaller than the numeral "7" that is a normally employed maximum numeral with respect to at least one ink color, e.g., yellow, whereby an image can be obtained without any deterioration of a quality while preventing a malfunction of color-staining from arising along the boundary between adjacent ranges each having an ink color.
Inventors
- 👤 Genji C/O Canon Kabushiki Kaisha Inada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 03:30
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/52; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/21; B41J2/2121; B41J2/2128; H04N1/40; H04N1/40025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
160 words
An ink jet printing apparatus for performing printing with the aid of an ink jet head adapted to eject liquid droplets therefrom by ejecting a plurality of liquid droplets from said ink jet head to a substantially same location on a printing medium to form a dot which constructs said printing, characterized by comprising; judging means for judging whether or not the number of liquid droplets for forming two dots located adjacent to each other on said printing medium is equal to or more than the predetermined numeral preliminarily determined corresponding to a combination made among numbers of liquid droplets required for forming each dot; and suppressing means for suppressing a quantity of liquid droplets for forming at least one of said two dots located adjacent to each other when said determining means determines that the number of liquid droplets required for forming said two dots located adjacent to each other is equal to or more than the predetermined numeral.
Claim 2
Dependent Claim
54 words
An ink jet printing apparatus as claimed in claim 1, characterized in that said judging means judges whether or not said number of liquid droplets is equal to or more than said predetermined numeral when said two dots located adjacent to each other are formed with liquid droplets each having a different color tone.
Claim 3
Dependent Claim
37 words
An ink jet printing apparatus as claimed in claim 2, characterized in that said suppressing means suppresses a number of liquid droplets required for forming at least one of said two dots located adjacent to each other.
Claim 4
Dependent Claim
60 words
An ink jet printing apparatus as claimed in claim 3, characterized in that said suppressing means selects any one from two kinds or more of preset maximum numbers of liquid droplets, said preset maximum numbers of liquid droplets being smaller than the number of liquid droplets required for forming each one of said two dots located adjacent to each other.
Claim 5
Dependent Claim
35 words
An ink jet printing apparatus as claimed in claim 4, wherein said ink jet head forms gas bubbles in liquid by utilizing thermal energy and then ejects liquid droplets therefrom as said gas bubbles grow.
Claim 6
Dependent Claim
47 words
An ink jet printing apparatus as claimed in claim 2, characterized in that said suppressing means suppresses an average quantity of liquid droplets that is a quotient obtained by dividing a total quantity of liquid droplets required for forming said dots by the number of liquid droplets.
Claim 7
Dependent Claim
58 words
An ink jet printing apparatus as claimed in claim 6, characterized in that said suppressing means selects any one from two or more kinds of preset average quantities of liquid droplets, said preset average quantities of liquid droplets being smaller than an average quantity of liquid droplets required for forming said two dots located adjacent to each other.
Claim 8
Dependent Claim
37 words
An ink jet printing apparatus as claimed in claim 7, characterized in that said ink jet head forms gas bubbles in liquid by utilizing thermal energy and then ejects liquid droplets therefrom as said gas bubbles grow.
Claim 9
Dependent Claim
35 words
An ink jet printing apparatus as claimed in claim 2, characterized in that said suppressing means suppresses a quantity of each of liquid droplets required for forming said two dots located adjacent to each other.
Claim 10
Dependent Claim
34 words
An ink jet printing apparatus as claimed in claim 9, characterized in that said suppressing means suppresses a quantity of each of liquid droplets by changing a frequency of ejection of said liquid droplets.
Claim 11
Dependent Claim
33 words
An ink jet printing apparatus as claimed in claim 10, characterized in that said suppressing means selects any one from two kinds or more of preset frequencies of ejection of said liquid droplets.
Claim 12
Dependent Claim
45 words
An ink jet printing apparatus as claimed in claim 11, characterized in that said two kinds or more of preset frequencies of ejection of said liquid droplets include at least one ejection frequency which is larger than a refill frequency of said ink jet head.
Claim 13
Dependent Claim
37 words
An ink jet printing apparatus as claimed in claim 12, characterized in that said ink jet head forms gas bubbles in liquid by utilizing thermal energy and than ejects liquid droplets therefrom as said gas bubbles grow.
Claim 14
Dependent Claim
153 words
An ink jet printing method of performing printing by ejecting a plurality of liquid droplets to a substantially same location on a printing medium to form a dot which constructs said printing, said method characterized by comprising the step of; providing an ink jet head for ejecting said liquid droplets therefrom, detecting the number of liquid droplets forming each dot, judging based on the result of said detecting, the number of liquid droplets forming two dots located adjacent to each other is equal to or more than the predetermined numeral preliminarily determined corresponding to a combination among numbers of liquid droplets required for forming each dot, and suppressing a quantity of liquid droplets for forming at least one of said two dots located adjacent to each other when the number of liquid droplets required for forming said two dots located adjacent to each other is equal to or more than the predetermined numeral.
Claim 15
Dependent Claim
66 words
An ink jet printing method of performing printing by ejecting a plurality of liquid droplets to a substantially same location on a printing medium to form a dot which constructs said printing, characterized by comprising the step of; suppressing a quantity of liquid droplets required for forming dots along the boundary between adjacent ranges each having a different color tone while said dot constructs the printing.
Claim 16
Dependent Claim
88 words
An ink jet printing method of performing printing by ejecting a plurality of liquid droplets to a printing medium to form a dot which constructs said printing, characterized by comprising the steps of; providing an ink jet head for ejecting said liquid droplets therefrom, and controlling liquid ejection in such a manner as to allow a frequency of ejecting said liquid droplets to include an ejection frequency larger than a refill frequency of said ink jet head when said dot is formed with a plurality of ink droplets.
Claim 17
Dependent Claim
26 words
A printed medium which receives a liquid droplet and was printed by using ink jet printing method claimed in any one of claims 14 - 16.
Claim 18
Dependent Claim
84 words
An ink jet printer comprising: judging means for judging whether or not the number of liquid droplets for forming two dots located adjacent each other on said printing medium is equal to or more than a predetermined number corresponding to a combination of numbers of liquid droplets required for forming each dot; and suppressing means for suppressing a number of liquid droplets for forming at least one of said two dots located adjacent each other when the output of said judging means is affirmative.
Claim 19
Dependent Claim
89 words
An ink jet printing method comprising the steps of: detecting the number of liquid droplets forming each dot; judging, from the result of detection, whether or not the number of liquid droplets forming two dots located adjacent each other is equal to or more than a predetermined number corresponding to a combination of liquid droplets required for forming each dot; and suppressing a number of liquid droplets for forming at least one of said two dots located adjacent to each other when the result of the judgement is affirmative.
Claim 20
Dependent Claim
67 words
An ink jet printer adapted so that in the event that the size of a liquid droplet is enlarged to such an extent that liquid droplets each having a different color come into contact with each other on a printing medium before completion of penetration into the printing medium, a maximum number of liquid droplets capable of overlapping each other at a substantially same location is limited.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.